Drainage is the most important component of the soil moisture balance equation for the soils and geographical area for which this study is carried out. An accurate estimate of the rate of water removed from a soil profile by deep percolation and seepage to subsurface drains or water reservoirs forma an essential part of a soil water balance equation especially in temperate and humid regions where evaporation is not the most influential factor. Consequently, deep tillage techniques will accomplished a sensible soil character improvements. Soil science technology and agricultural engineering were applied  many methods to improve soil surface layers and their structures. Normal and deep tillage or sub-soiling were usually beneficial in conserving moisture in the sequence soil layers. An empirical drainage equation was developed to predict declination of soil moisture movement after applying sub-soiling system before traditional tillage. Even this procedure improvement clay and heavy clay soils by improving their properties and porosity, increase wheat crop yield in both soils by 9-10%. For various soil types (Clay ration (Cr)=: 0.12 sandy, 0.28 sandy loam, 0.43 silty loam, 0.86 clay, 1.66 heavy clay soil), Elbanna (1993) drainage equation was simplified validated to predict water flux, mm/day,  as exponential function of soil moisture content mm at previous day to profile with high explanation coefficient..